电法在菲律宾AREA矿区红土镍矿勘探中的应用

Application of the Electrical Method to Exploration of Lateritic Nickel in the AREA Mine District,Philippine

菲律宾AREA矿区红土镍矿为硫化镍矿岩体风化-淋滤-沉积形成的地表风化壳型矿床,矿体赋存在含矿风化基岩中。为圈定该矿区红土镍矿有利地段,依据岩(矿)石物性特征、矿体地质特征,采用对称四极电阻率剖面法(简称对称四极法)面积性测量,发现低阻异常;利用高密度电阻率测深法(简称高密度电法)剖面,对成矿有利地段进行评价并确定含矿层厚度和产状,圈定镍矿富集部位。工程验证结果表明,见矿较好位置与电法结果吻合较好。研究结果表明,红土镍矿勘探在前期工作中,采用电阻率法可圈定含矿层范围和延伸产状,有效缩小勘探范围,指导工程勘探布置,节约勘探成本。

The laterite nickel deposit in AREA mine district,Philippine is a surface weathering crust type deposit formed by weathering,leaching and deposition of nickel sulfide rock mass,which occurs in the ore-bearing weathered bedrock.In order to delineate the favorable zone of this laterite nickel deposit,according to the physical characteristics of rock(ore)and geological characteristics of the ore body,the symmetrical quadrupole resistivity profile method(symmetric quadrupole method for short)is adopted to conduct an aerial measurement,revealing low-resistivity anomalies there.The high-density resistivity sounding method is used to evaluate the favorable zones of mineralization,determine the thickness and occurrence of ore-bearing beds,and delineate the enrichment sites of nickel ore.The results of engineering verification show that the promising position of ore detection is in good agreement with the results of the electrical survey.Research indicates that in the early stage of laterite nickel exploration,the resistivity method can delineate the ore-bearing bed range and extension occurrence,effectively reduce the exploration range,guide the engineering exploration layout,and save the exploration cost.